A soil borne pathogen is a disease-causing agent which lives both in soil and in a plant host, and which will tend to infect undiseased plants which are grown in that soil. Common soil borne pathogens include Fusarium,Pythium,Rhizoctonia,Phytophthora,Verticillium,Rhizopus,Thielaviopsis, and nematodes including Meloidogyne.